Flash device and heat pump device including same

Abstract

The invention discloses a flash device and a heat pump device including the flash device. The flash device comprises a first cavity, a second cavity and a valve assembly. The first cavity is provided with a two-phase freezing medium flow inlet and a liquid freezing medium flow outlet. The first cavity communicates with an air supplementing opening of a compressor through a first air supplementing pipe. The second cavity communicates with the first cavity through a refrigerant channel. The flow area of a refrigerant is increased when the refrigerant flows from the refrigerant channel to the second cavity. The second cavity communicates with the air supplementing opening of the compressor through a second air supplementing pipe. The valve assembly is used for controlling the first air supplementing pipe to be connected with or disconnected from the air supplementing opening and controlling the second air supplementing pipe to be connected with or disconnected from the first air supplementing pipe. By means of the arrangement, the flash device can ensure that the heat pump device runs in a good state, and then the reliability of a heat pump system is improved.

Description

technical field [0001] The invention relates to the technical field of heat pumps, more specifically, to a flasher and a heat pump device including the flasher. Background technique [0002] The heating capacity and COP (coefficient of performance, cycle performance coefficient) of a single-stage compressed air source heat pump decay rapidly as the outdoor temperature drops, while the exhaust temperature rises rapidly, resulting in a decrease in comfort, economy, and reliability with the ambient temperature And lower. [0003] The emergence and application of quasi-two-stage or two-stage compression supplementary air enthalpy increase technology can effectively increase the heating capacity and COP, and reduce the exhaust temperature. Gas replenishment and enthalpy increase technology usually uses a flasher to form a circulation system. This system replenishes the medium-temperature and medium-pressure gas refrigerant in the flasher to the gas inlet of a quasi-two-stage or ...

AI Technical Summary

Problems solved by technology

[0004] Although the technology of supplementing air to increase enthalpy can reduce the exhaust temperature, the evaporation temperature and condensation temperature of the air source heat pump system vary widely, especially for heat pump water heater products, resulting in a large change in the pressure ratio of the compressor.

Theoretical and experimental results show that: when the pressure ratio is small, the quasi-two-stage and two-stage air source heat pump systems do not need to supplement air to increase enthalpy or only need to supply a small amount of gas. Excessive air supplement or even liquid supplement will lead to a decrease in system capacity and COP ; and when the pressure ratio is large, the exhaust temperature of the system will still be on the high side, and even the exhaust temperature will exceed the maximum limit value of the compressor, and the reliability is difficult to be guaranteed

[0005] In the prior art, the flasher adopts a single cavity structure, which can achieve two states: off gas replenishment and gas replenishment with liquid. Since the flasher in the prior art cannot achieve 100% gas-liquid separation effect, the gas replenishment It is entrained with liquid, and the ratio of liquid replenishment volume / air supply volume is difficult to change, resulting in too much liquid replenishment volume when the pressure ratio is small, and the compressor high-pressure cylinder sucks liquid, but when the pressure ratio is high, the fluid replenishment volume is too small and the exhaust temperature is high , the heat pump system is difficult to operate in an optimal state, and the reliability is reduced

[0006] Therefore, how to solve the problem in the prior art that the flasher cannot ensure that the heat pump system operates in an optimal state, resulting in low reliability of the heat pump system, has become an important technical problem to be solved by those skilled in the art.

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